Which of these is an advantage of reproduction by seed?
a. New plants can absorb nutrients from parent plants during periods of drought and disease.
b. New plants can grow in biomes where water and sunlight are absent.
c. New plants can grow in areas without competing with their parents for resources.
d. Seeds discourage herbivores from grazing on young plants while they develop and grow.
c. New plants can grow in areas without competing with their parents for resources.
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Circulatory systems compensate for _____
A) temperature differences between the lungs and the active tissue B) the slow rate at which diffusion occurs over large distances C) the problem of communication systems involving only the nervous system D) the need to cushion animals from trauma E) the need that fetal organisms have for maintaining an optimal body temperature
When scientists are attempting to breed for increased ability of a plant to utilize carbon dioxide they must consider improvement of:
A. stomatal openings B. bundle-sheath cells C. mesophyll air spaces D. chlorophyll production E. stress tolerance
The numerous, different species of Hawaiian honeycreepers that can be identified are a classic example of what concept?
a. adaptive radiation b. convergent evolution c. reticulate evolution d. homology e. punctuated equilibrium
Which of the following methods used to study proteins is limited to proteins with a molecular mass of 50 kD or less?
(a) X-ray crystallography (b) fingerprinting (c) nuclear magnetic resonance (d) mass spectroscopy